On Fri, Jun 26, 2009 at 02:36:23AM +0800, Jaya Kumar wrote:

On Fri, Jun 26, 2009 at 2:12 AM, Andrew Morton[off-list ref] wrote:

quoted

On Fri, 26 Jun 2009 02:38:06 +0900
Paul Mundt [off-list ref] wrote:

quoted

On Thu, Jun 25, 2009 at 12:03:59AM -0700, Andrew Morton wrote:

quoted

On Thu, 25 Jun 2009 15:06:24 +0900 Magnus Damm [off-list ref] wrote:

quoted

There are 3 levels of dependencies:
1: pgprot_noncached() patches from Arnd
2: mm: uncached vma support with writenotify
3: video: arch specfic page protection support for deferred io

2 depends on 1 to compile, but 3 (this one) is disconnected from 2 and
1. So this patch can be merged independently.

<hunts around and finds #2>

I don't really understand that one. ?Have we heard fro Jaya recently?

He's been having some personal problems so he's been quiet. :-)

Magnus's defio changes, #3 look fine to me. I don't know much about #2
but what I understood was that the previous mmap_region code was
unintentionally turning caching back on when it did the writenotify
test and I guess Magnus's goal with the patch is to make sure that
address range is left uncached since sh_mobile uses DMA to transfer
the framebuffer and he might have encountered coherency issues there?

Correct. This could have been documented a bit better, but yes, the issue
is that when the writenotify test kicks in the vma silently loses its
uncachedness which leads to the aforementioned runtime behaviour issues.

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